Abstract
Treatment of desoxyanisoin with 9,10-dihydro-9-oxaphosphaphenathrene-10-oxide (DOPO) in the presence of an acid catalyst generates an adduct, 1-dopyl-1,2-(4-methoxyphenyl)ethene which may be readily converted to the corresponding diphenolic compound, 1-dopyl-1,2-(4-hydroxyphenyl)ethene (BDE). This material behaves as an effective curing agent for the diglycidyl ether of bisphenol A (DGEBA) to provide a thermally stable (Tdec 417 °C) resin with Tg of 146 °C. This polymer displays outstanding flammability characteristics – an LOI of 36 (compared to 19 for conventionally cured resin), a total heat release of 20 kJ/g and a UL 94 V0 rating. The flame retardant impact of the incorporation of this hardner into the resin is due both to its structure (promotes char formation for solid phase activity) and the presence of the DOPO substituent (promotes gas-phase activity).
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